Cleaning, Inspection And Repair Of Main Landing Gear; Installation Of Main Landing Gear - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
f. Disconnect the outboard gear door retraction rods (54) at the gear housing (40). With the lower
side brace link (35) disconnected from the housing, the gear may be removed by removing the attachment bolt
assemblies at the attachment plates (37 forward) on each side of the gear housing. Note, if any, the number and
location of spacer washers between the gear housing and attachment plates.
g. The uplock hook (I I) and spring (9) may be removed by disconnecting the uplock rod or cable (14)
from the hook and then the hook pivot bolt.
h. The uplock rod or cable (14) may be removed by disconnecting the rod or cable end at the lock
crank (21).
i. The landing gear and upper drag link attachment plates may be removed by reaching through the
access holes to the nuts that secure the plates. While holding the nuts, wrench the attachment bolts.
7-23. CLEANING, INSPECTION AND REPAIR OF MAIN LANDING GEAR.
a. Clean all parts with a suitable cleaning solvent.
b. Inspect bolts, bearings, bushings and ball joints for excess wear, corrosion and damage.
-
WARNING -
Refer to latest revision of Piper Service Bulletin 845 for specific
inspection/replacement instructions for the Main Landing Gear
Forward Side Braces. Piper considers compliance with service
bulletins mandatory.
c. Inspect the gear housing, side brace links, idler links, rods and attachment plates for cracks,
bends or misalignment and upper bearing block retainer pins for damage.
d. Inspect lock hook for wear and oversized bearing surfaces.
e. Inspect the lock hook springs for the following:
1. Excess wear or corrosion, especially around the hook portion of the springs. A spring should
be rejected if wear or corrosion exceeds one-quarter the diameter of the spring. Clean away all corrosion and
repaint the springs.
2. Check the lock hook springs for load tension below the minimum allowable tolerances. The
minimum tension for the uplock hook spring is 4 pounds, and the minimum tension for the downlock hook
spring is 7 pounds. These checks are performed by fastening a fish type scale to the particular hook and spring
and pulling against the hook and spring to get a reading on the scale.
f. Inspect the uplock roller for freedom of movement and minimum wobble.
g. Inspect lock rod or cable end bearings for corrosion, damage and freedom of movement. Also in-
spect the sliding surfaces of the uplock rod.
h. General condition of limit switches and wiring for fraying, poor connections or conditions that
may lead to failures.
i. Attach the upper and lower drag links and check that when stop surfaces of the two links contact,
linkage is 0.063 to 0.156 inch through center. (Refer to Figure 7-9.) Should this distance exceed the required
through center travel and all bolts and bushings are tight, replace one or both side brace links.
j.
Repair of the landing gear is limited to reconditioning of parts such as replacing bearings and
bushings, smoothing out minor nicks and scratches, repainting of areas where paint has chipped or peeled and
replacement of parts.
7-24. INSTALLATION OF MAIN LANDING GEAR. (Refer to Figure 7-9.)
- NOTE -
When assembling any units, lubricate bearings andfriction surfaces
with proper lubricant as described in Section II
a. Position the attachment plates of the landing gear housing and upper drag links and bolt in place.
b. The uplock hook (11) may be installed by the following procedure:
1. Place the "U" end of the uplock spring (9) over the back of the hook with the loops also
toward the back.
2. Spread the spring and fit the loops over the bushing that extends through the hook.
3. Slide the hook inboard through the bracket until the bracket hole aligns with the bolt hole
in the hook.
Revised: March 5, 1984
Interim Revision: October 9, 1987
2E12 LANDING GEAR AND BRAKE SYSTEM